import bpy

class a():

    @classmethod
    def methodA():
        print("a")
        
class b(bpy.types.Panel):
	bl_space_type = 'PROPERTIES'
	bl_region_type = 'WINDOW'
	bl_label = 'Test'
		
	def draw(self,context):
		print("b")
		a.methodA()
		
	